using System.Security.Cryptography.X509Certificates;
using SchoolContracts.BindingModels;
using SchoolContracts.SearchModels;
using SchoolContracts.StoragesContracts;
using SchoolContracts.ViewModels;
using SchoolDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;

namespace SchoolDatabaseImplement.Implements
{
    public class DisciplineStorage : IDisciplineStorage
    {
        private void CheckSearchModel(DisciplineSearchModel model)
        {
            if (model == null)
                throw new ArgumentNullException("Передаваемая модель для поиска равна нулю", nameof(model));
            if (!model.Id.HasValue && !model.ImplementerId.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue && model.ClientsIds == null)
                throw new ArgumentException("Все передаваемые поля поисковой модели оказались пусты или равны null");
            if (model.DateFrom.HasValue != model.DateTo.HasValue)
                throw new ArgumentException($"Не указано начало {model.DateFrom} или конец {model.DateTo} периода для поиска по дате.");
        }
        public DisciplineViewModel? Delete(DisciplineBindingModel model)
        {
            using var context = new SchoolDB();
            var element = context.Disciplines.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                context.Disciplines.Remove(element);
                context.SaveChanges();
                return element;
            }
            return null;
        }

        /// <summary>
        /// Получение списка счетов по клиенту и дисциплине, для получения полной и оплаченной стоимости в бизнес логике
        /// </summary>
        public List<AccountViewModel> GetAccountsFromDisciplineAndClient(DisciplineSearchModel modelDiscipline, StudentSearchModel modelStudent)
        {
            if (!modelDiscipline.Id.HasValue)
            {
                throw new ArgumentNullException(nameof(modelDiscipline), "Получена поисковая модель без Id");
            }
            if (!modelStudent.Id.HasValue)
            {
                throw new ArgumentNullException(nameof(modelStudent), "Получена поисковая модель без Id");
            }
            using var context = new SchoolDB();
            var studentByDiscipline = context.StudentsByDisciplines
                .Include(x => x.Accounts)
                .FirstOrDefault(x => x.ClientId == modelStudent.Id && x.DisciplineId == modelDiscipline.Id);
            if (studentByDiscipline?.Accounts == null)
            {
                throw new InvalidOperationException(
                    $"Не существует связи между данным учеников(Id={modelStudent.Id}) и (Id={modelDiscipline.Id})");
            }
            return studentByDiscipline.Accounts.Select(account => (AccountViewModel)account).ToList();
        }

        public DisciplineViewModel? GetElement(DisciplineSearchModel model)
        {
            using var context = new SchoolDB();
            if (!model.Id.HasValue)
            {
                return null;
            }
            return context.Disciplines
                .Include(x => x.Student)
                .Include(x => x.Students)
                .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id);
        }

        public List<DisciplineViewModel> GetFilteredList(DisciplineSearchModel model)
        {
            CheckSearchModel(model);
            if (model.Id.HasValue)
            {
                var res = GetElement(model);
                return res != null ? new() { res } : new();
            }

            using var context = new SchoolDB();

            var query = context.Disciplines.Include(x => x.Student);
            IQueryable<Discipline>? resultQuery = null;
            if (model.ImplementerId.HasValue)
            {
                return query
                    .Where(x => model.ImplementerId == x.ImplementerId)
                    .Select(x => (DisciplineViewModel)x)
                    .ToList();
            }

            if (model.DateTo.HasValue)
                resultQuery = query
                    .Include(x => x.Students)
                    .ThenInclude(x => x.Student)
                    .Include(x => x.Requirements)
                    .ThenInclude(x => x.Requirement)
                    .Where(x => model.DateFrom <= x.DateOfReceipt && x.DateOfReceipt <= model.DateTo);

            else if (model.StudentsIds != null)
                resultQuery = query
                    .Include(x => x.Students)
                    .ThenInclude(x => x.Student)
                    .Where(x => x.Clients.Any(x => model.StudentsIds.Contains(x.StudentId)));

            return resultQuery?
                .Select(x => (DisciplineViewModel)x)
                .ToList() ?? new();
        }

        public List<DisciplineViewModel> GetFullList()
        {
            using var context = new SchoolDB();
            return context.Disciplines
                .Include(x => x.Student)
                .Include(x => x.Students)
                .Select(x => (DisciplineViewModel)x)
                .ToList();
        }

        public DisciplineViewModel? Insert(DisciplineBindingModel model)
        {
            var newDiscipline = Discipline.Create(model);
            if (newDiscipline == null)
            {
                return null;
            }
            using var context = new SchoolDB();
            context.Disciplines.Add(newDiscipline);
            context.SaveChanges();
            newDiscipline.UpdateClients(context, model);
            context.SaveChanges();
            return newDiscipline;
        }

        public DisciplineViewModel? Update(DisciplineBindingModel model)
        {
            using var context = new SchoolDB();
            var disciplinevisit = context.Disciplines.FirstOrDefault(x => x.Id == model.Id);
            if (disciplinevisit == null)
            {
                return null;
            }
            disciplinevisit.Update(model);
            disciplinevisit.UpdateClients(context, model);
            context.SaveChanges();
            return disciplinevisit;
        }
    }
}